BCBG evening gown size S

This dress is hard to photograph well because it is ALL about that drape. The material is medium-weight polyester which drapes beautifully to floor length. I honestly don't understand how they managed to make it drape so beautifully across the bottom of the back, but also have the dress be nearly backless. The construction in this thing is amazing. Chain lays asymmetrically across the back, and there is ruching on the right hip. Also on the right side is a thigh-high slit. Color is described as "Prussian Blue" on the tag, which is a very dark blue but can look slightly purple in some lighting.